portapack-mayhem/firmware/common/buffer.hpp

/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __BUFFER_H__
#define __BUFFER_H__

#include <cstdint>
#include <cstddef>

/* LPC43xx RTC structure. Avoiding using the ChibiOS-defined structure because
 * it pulls in all sorts of dependencies and initialization and other stuff that
 * the M0 needs to remain in control of.
 *
 * But yes, this is a hack, and something better is needed. It's too tangled of
 * a knot to tackle at the moment, though...
 */
#if defined(LPC43XX_M4)
struct Timestamp {
    uint32_t tv_date{0};
    uint32_t tv_time{0};

    static Timestamp now();
};
#endif

#if defined(LPC43XX_M0)
#include "lpc43xx_cpp.hpp"

using Timestamp = lpc43xx::rtc::RTC;
#endif

template <typename T>
struct buffer_t {
    using Type = T;
    T* const p;
    const size_t count;
    const uint32_t sampling_rate;
    const Timestamp timestamp;

    constexpr buffer_t()
        : p{nullptr},
          count{0},
          sampling_rate{0},
          timestamp{} {
    }

    constexpr buffer_t(
        const buffer_t<T>& other)
        : p{other.p},
          count{other.count},
          sampling_rate{other.sampling_rate},
          timestamp{other.timestamp} {
    }

    constexpr buffer_t(
        T* const p,
        const size_t count,
        const uint32_t sampling_rate = 0,
        const Timestamp timestamp = {})
        : p{p},
          count{count},
          sampling_rate{sampling_rate},
          timestamp{timestamp} {
    }

    operator bool() const {
        return (p != nullptr);
    }
};

#endif /*__BUFFER_H__*/